JP2537414B2 - Ignition timing control device for internal combustion engine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition timing control device for an internal combustion engine, and more particularly to a technique for suppressing knocking.

<Prior Art> The following is a conventional example of this type of ignition timing control device.

That is, the ignition timing ADV is set according to the engine operating state (for example, engine speed and engine load), and the ignition plug is ignited at the set ignition timing ADV. Further, when knocking occurs in a high load operation region of a predetermined value or more, the ignition timing ADV is retarded by a predetermined amount (for example, 1 °) to suppress the occurrence of knocking. Further, when no knocking occurs, the ignition timing is advanced as much as possible in the vicinity of the knocking non-generation limit region to increase the engine output (hereinafter referred to as knock control).

<Problems to be Solved by the Invention> However, in such a conventional ignition timing control device, knock control is performed in a high load operation range of a predetermined value or more. Due to variations, it is necessary to advance / retard the ignition timing in the low load operating range as well as the high load operating range.
Such a need also occurs depending on weather conditions (for example, temperature).

The present invention has been made in view of such circumstances,
An object of the present invention is to provide an ignition timing control device for an internal combustion engine that can secure an optimum ignition timing in all operating ranges.

<Means for Solving the Problems> Therefore, according to the present invention, as shown in FIG. 1, the basic ignition timing setting means A for setting the basic ignition timing according to the engine operating state and the knocking for detecting the occurrence of knocking. In the detection means B and a predetermined knock control range of a predetermined load or more,
Based on the detection signal of the knocking detection means B, the ignition timing retard amount is set when knocking occurs, while the ignition timing advance amount is set when knocking does not occur.
A retard amount setting means C, an ignition timing correcting means D for correcting the basic ignition timing based on the set retard amount or advance amount in the predetermined knock control region, and the predetermined knock control region. In an ignition timing control device for an internal combustion engine, comprising: ignition control means F for igniting a spark plug E based on the corrected ignition timing, a retard angle amount and an advance amount set in the predetermined knock control range are set. Knock correction amount setting means G for setting a knock correction amount corresponding to the deviation from the basic ignition timing based on the angular amount.
And a writing means I for writing the set knock correction amount in the storage means H, and a determining means for determining whether the predetermined knock control area or a non-knock control area of less than a predetermined load that does not require knock prevention control. J, a retrieval unit K that retrieves a knock correction amount from the storage unit H when it is determined to be in the non-knock control range, and an ignition that sets an ignition timing based on the retrieved knock correction amount and the basic ignition timing. The timing setting means L and the non-knock control range ignition control means M for igniting the ignition plug based on the ignition timing set by the ignition timing setting means L are provided.

<Operation> In this way, in the knock control region, the ignition timing is advanced / retarded based on the detection signal of the knocking detection means, and the knock correction amount is obtained based on the advanced / retarded amount to be stored in the storage means. Remember. Then, in the non-knock control range, the ignition timing is set from the knock correction amount of the storage means and the basic ignition timing.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, a control device 1 including a microcomputer includes a reference signal (corresponding to the engine speed) and a position signal from a crank angle sensor 2, an intake air flow rate detecting means from an air flow meter 3, and a knocking signal. The knocking detection signal from the knocking sensor 4 as the detection means and the cooling water temperature detection signal from the water temperature sensor 5 are input.

The control device 1 operates according to the flow chart of FIG. 3 and outputs an ignition signal to the spark plug 7 at the set ignition timing via the ignition device 6 including an ignition coil, a power transistor, etc. to perform ignition operation. It has become.

Here, the control device 1 advances the basic ignition timing setting means.
A retard amount setting means, an ignition timing correction means, a knock correction amount setting means, a storage means (RAM), a writing means, a determining means, a searching means, and an ignition timing setting means are configured. In addition, the control device 1
The ignition device 6 constitutes an ignition control means and an ignition control means for the non-knock control range.

Next, the operation will be described with reference to the flowchart of FIG. This routine is executed every 10 msec.

 At S1, various signals from the crank angle sensor 2 and the like are read.

In S2, it is determined whether or not the current operating region is the knock control region (see FIG. 4) of the high load operating region of a predetermined value or more. If YES, the process proceeds to S3, and if NO, the process proceeds to S7.

In S3, it is determined whether or not knocking occurs based on the detection signal of the knocking sensor 4, and when YES, S4
If NO, proceed to S5.

At S4, a retard angle amount (for example, 1 °) is set to suppress the occurrence of knocking. This retard amount may be changed and set according to the knocking level.

In S5, the advance amount (eg 1 °) to advance the ignition timing.
Set.

In S6, the calculation of the deviation from the basic ignition timing will be described later, based on the retard amount and the advance amount, which is set in S4 or S5, knock correction amounts beta ₁ the deviation, fourth as · · · beta _n As shown in the figure, it is stored in the RAM corresponding to the engine speed.
Specifically, the knock correction amount is a value obtained by sequentially adding or subtracting the retard amount or the advance amount set when knocking occurs over time.

On the other hand, in the low load operation region less than the knock control region, in S7, the knock correction amount is retrieved from the RAM based on the current engine speed.

In S8, the found knock correction amount is weighted (for example,
Multiply by 1/2) to calculate the correction amount.

In S9, the basic ignition timing is searched from the map based on the engine load and the engine speed.

In S10, the retrieved basic ignition timing is corrected by one of the retard amount set in S4, the advance amount set in S5, and the correction amount set in S8, and the ignition timing is adjusted. To set.

At the ignition timing thus set, an ignition signal is output to the spark plug 7 via the ignition device 6 and the ignition operation is performed.

As described above, the knock correction amount, which is the deviation from the basic ignition timing, is calculated from the advance amount and the retard amount obtained based on the detection signal of the knock sensor 4 during knock control, and the non-knock control range is calculated. In this case, since the knock correction amount is weighted to correct the basic ignition timing, the following effects are obtained.

That is, the basic ignition timing is similarly set by a map or the like regardless of the engine, but the required ignition timing of the engine is different between the engines or the use timing depending on the manufacturing variation among the engines, the compression ratio between the engines, or the difference in weather conditions. Is different. For this reason, the basic ignition timing is corrected during non-knock control based on the knock correction amount obtained during actual knock control of the engine, so that the optimum ignition timing that matches the required ignition timing of the engine is determined. It can be secured even in the knock control range.

Of course, in the knock control range, the knock sensor 4
Since the ignition timing is advanced / retarded based on the detection signal of, the optimum ignition timing matching the engine can be secured even if the required ignition timing of the engine differs between the engines.

<Effects of the Invention> As described above, the present invention is based on the detection of the progress signal based on the detection signal of the knocking detection means in knock control.
The knock correction amount is set from the retard angle amount and stored in the storage means, and the ignition timing is set from the knock correction amount and the basic ignition timing in the non-knock control range. Even if the required ignition timing is different, the optimum ignition timing can be secured in the entire operating range.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is a configuration diagram showing an embodiment of the present invention, FIG.
FIG. 4 is a diagram for explaining the operation of the above. 1 ... Control device, 4 ... Knocking sensor, 6 ... Ignition device, 7 ... Ignition device

Claims (1)

(57) [Claims] 1. A basic ignition timing setting means for setting a basic ignition timing according to an engine operating state, a knocking detection means for detecting occurrence of knocking, and a knocking detection means in a predetermined knock control range of a predetermined load or more. The advance / retard amount setting means for setting the retard amount of the ignition timing when knocking occurs based on the detection signal, and the advance / retard amount setting means for setting the advance amount of the ignition timing when no knock occurs. An ignition timing correction means for correcting the basic ignition timing on the basis of the set retard amount or advance amount; and an ignition plug ignition operation based on the corrected ignition timing in the predetermined knock control range. In an ignition timing control device for an internal combustion engine, comprising: an ignition control means for controlling the ignition timing control means, And a knock correction amount setting means for setting a knock correction amount corresponding to a deviation from the basic ignition timing, a writing means for writing the set knock correction amount in a storage means, the predetermined knock control area, or a predetermined knock control area. Determination means for determining whether or not the knock prevention control is less than the load and which does not require knock prevention control; and search means for searching for the knock correction amount from the storage means when determined to be the non-knock control area; and the searched knock correction amount And an ignition timing setting means for setting an ignition timing based on the basic ignition timing, and a non-knock control range ignition control means for igniting an ignition plug based on the ignition timing set by the ignition timing setting means, An ignition timing control device for an internal combustion engine, comprising: